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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17a1277fd19f757e8e6379ed171c09e07c95553e816fe3afb2307abbd0a1c1d' 
  AND token = 'DNWXKhhZKWkqWlqqSQ8dr4iWNX5bzBHS67c+RHxCOy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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