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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f2f5fc1d43947cb6de84253656682aec9dcf96fbb7c9fd4ebe0c729fa4ce16' 
  AND token = 'Zp1d0wJ6G3tt2PhJDre6//pILQ/izKy2I1/yHWI80yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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