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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf2c3e31a7f8f4068ce08bac5717bef23d31a712f5b89836beeda46d7df12d1' 
  AND token = 'a1aC54TrsoV0e2ov0FdxckziS5MaG7rMM89EKTRtSgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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