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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959372f91691159b6744ed5a5d64f7c9bec4ef2691204b2ec0b48710828a67bf' 
  AND token = 'wM1RuhCR03B3atpXNuj/vBcfd3IisGKMxr7xIqzEeys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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