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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dc88f7d413b38f26997b60e0d13861789e8c2c63bf2e8806a38b1a29af9a8d' 
  AND token = 'eZ1U7RbGJ1BULf17XawdAIbR4oun6ZWFpONf3m8kNd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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