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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5d415c557e7e50b6325fafb8d93d8012ec40aa2e6d43d8869c3592b73a0a88' 
  AND token = 'nO/Vk6SspSnfZNhZh+AcfXLdit2w6417o8pRxo/6Li8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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