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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af40244a90e2c6397163bb83310b50f15eb799159bfe8d313d98f64785dac0ad' 
  AND token = 'K5fT7PGdvM72EDJ6cyvya7DkFvEpsq6T7P0tIIr4CVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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