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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec06dfb3a3d7ddc80e4d9a31808d872ed70f4fda6b9a86025c3e2e915e1b8cb' 
  AND token = 'eH9clsG6gpR5rRlVQ+mwZh3vEJTxTpeBd6TOgSKHGnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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