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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71ae93413cf6cf6f2aafa15c39b7d2e9ea7bd9dbd68fcd6ef1a7cbce3a71c80' 
  AND token = 'zTQqmYNEpGkxx2LMbyI1uFpaHgHQtxSGSpgohygdLSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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