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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2843ba5a1f8f2f168bad6524560c998e9da295451cd5b9e92b00d4ef1e6d7d23' 
  AND token = 'LZKDxZ8J8SkMPIQh625g0HP4ELWmscjtPKAUtwLSF64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}