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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4558656202b983da1a59a5cbb9882f9535bcbe985c0fe7d615efbfb8e51e8c7' 
  AND token = '0dEmp6ITOfkpYoNZ9cBHZ5vZRrWhLja+nIQ2tEeB29U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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