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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339babcbf5fe54fc72d1312bdfc0e12c9b144c60eed7ea42cd3bdab79ef58128' 
  AND token = 'XtgU4fvMcpH19fqBeN6c/0MDi40NjzVnwrQPpfPzP8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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