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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e14a1bb62b94cfd64a4882dd4d2fedb3e2b9722281e3f72fe6d2e53fc2dba6a' 
  AND token = 'z8lmG7K0A2sVJXZCGLqMEu25/qEobCD/30QrlenVpvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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