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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54442d1cbe559a47db5b887ccc480bd967c2e704b09c4ce9dde7d194bf25affb' 
  AND token = 'qmpw/zpCCEZcsjF99iRAdq0ZrPxRkEbbL8eqslfum/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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