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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b22ffd5464ca28d65c7a7c6edc3b1b070279ab3bd57d0156d85bcba2173bf7d' 
  AND token = '1Vu7yJqyOj9UQNTAmFidEcu7l/43hiPLtyi3h+GbauI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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