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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f69c82636e076cf18f557e78b0309f0599ddad3722f0bcd7834be36b313be63' 
  AND token = 'J9H2/5EkN2WS0UAOHENGUOFRPZfjVn8QLOs/uVnJRN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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