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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d778ae67ab938f6f154918d051561a0a246eb23e29294000b797552020bb4c8' 
  AND token = 'iIv5iYitEDovNi/qd0X6D8J5rU4sgLZ0vRgosIFxMGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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