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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55aef7adadd7c089ac09c67373dcff499a1283442cdf4f29003e6705653a00fd' 
  AND token = 'tk4Uu4GpRo98yHSb7Imc3WKmymLlEePOWfjjvUUECqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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