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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c96baccd5776dce19138889fd20b5572cce475824c96a7291537d097f8efd31' 
  AND token = 'uripIiQzzgy9pf2xCtDyadEUI8nEjY94x9hb2ik55lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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