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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5bfee5d5347493a66314d5065dd1505975929beaffea5c7b3fb4ec2c3ce4d19' 
  AND token = '4lepI/+Ewz7WHaRh6xaKYbJ2Y50rNosbBin4JzORAL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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