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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11875f4da91dc8dfa91e043be22376dc3fcad58126eeb63228130f180455b841' 
  AND token = 'B6i+nOqh8Vd1JPAp1FvLkJeq2ooCFxP1pQLdKevfiUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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