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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b0a3f63f106a0ef306b599ddebae0305adc1a292b1a67fa0fb8906cf615c348' 
  AND token = 'C5GM0o106HyBchZz/cYQMXfNbk1Z3z8N66M1BmDUoqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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