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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef006e48446968ec01d5674eb8e0ea977a0d9fb72dba3ceffa1c956abf68d1c' 
  AND token = 'eFUrRswE6jFzQJdDi6gKTyfMSMvtgltuaILM/Jpjqqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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