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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e046636c68caf9163469fabe885022f757c68632535b5293499105f3f91cecdd' 
  AND token = 'yGJwr17gm2BuauOjniNbBJWnJehHByI4jQkmonnqfcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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