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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b656a5abfe8596c9b470e0a5408eb2dda4d290ed502d68cd2447e948e78cfdd' 
  AND token = 'bA+2L8Q7oTiEEK3EHykHWjaQAf2MpSN5w6jYbofB1sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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