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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08039874f2e7afb01a98c03df6b6ea7bbfa7c2c47615489ba3be5bc2d525543c' 
  AND token = 'XHQbMHyMJRq9Eza2LMv98tFQB6CLQSN6Fv/5nKz9FVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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