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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d2be8bdf7f817cb0a6d05a190a41351aa9df05b63662e1139340b41ff9b5b1' 
  AND token = 'NFXXP+onvQ3fr0FD0a1wgQXSmzPoBO78tyYkEl/WhBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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