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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650a5f6737d138ebfc08928685d94f68b90c9ab4c5223015bf6e68a12a07c59b' 
  AND token = 'Et+SBqsnyXF2L5ehEr5TxU89YgloygIF/nZFsjdzFo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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