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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1103615efe8f6a6b37d18b208d0e4f422377828661eda8c6601a184c79686c2c' 
  AND token = 'BnA+4N0mkJN6W8Ay2LUvzL4zOcHRPP5ojzdGcyactbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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