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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cb18f895d1e5341aba6b5df63ee79ef678cceb0f2ea3d2609e71ad2279ba2c1' 
  AND token = 'w/BuOZaKsSdc8y1pi67+Oxdi4OwvDjJqurk9RGo0SI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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