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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7982c884e0897de28ffa4c18432b98651036bf4eac51b14ac50d11262c568251' 
  AND token = 'dVPEBt0ynZN4T7Zmio5Qsr/S7G+fG/ryH88qfR6QCYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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