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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45dee550fbb181249849fa613b33e8a2de71c7b0230a9ad759efd93a2ae434f' 
  AND token = 'yY0vpLY2cz2i0vgcRdWtSxUnBb9RRxUomOBYAKKuqF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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