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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3006b93916076c58b5dfc65649f7d329b39a79dede3cdcdf4d9b838402f4734' 
  AND token = 'eA4p2nT+uNgD3GGAla/8uHjSPeUxI8NubwoX740sw/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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