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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a43c310d4a6643f4c2d5aa97b7fbfd7c869d146f33347167f37756350124ad91' 
  AND token = 'KWorgaxnasY38bh3JBRrZZ9OUkYW6SZrD2Kcq6nsmTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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