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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4aeb2cca8f29b3ac40ceb0d58e67b30c6add17ba847326bf33e4597dcacb10' 
  AND token = '/6nKhS/OajeCgS02F6W9weX4fq4mM32DnX3vbIkeq9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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