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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49cda9f9f26ea1049279a61a3aa5c26f2bf15b7d53ba800371899fba8b7c94cd' 
  AND token = 'Aj/aBull4ZvCmIj+Sr9r9iEk2fsBPRGmBEoDnQ13j/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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