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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bd1767d80304d595e766f63a2d81829fc4b77c7d754dae927753836f5d5bec7' 
  AND token = 'XpLWy6yjWNyah5d37CAt14hALxvnONu/UzYI4J/Qxno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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