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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7dda33d28671c0c26538bf4d29d25cc750c4f85d68b5196db38a96af3b6aac' 
  AND token = 'lpQqqIDbT4zDPslz9HOtsSMbLLVV5G3KTq2GP/1C95g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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