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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd90b02dd93f914a02e57325205082e6b7bd4671e940135fe5a999e29d859640' 
  AND token = 'CjD3xEIcSDVkY1BU1ht57mPDcbxOXg+2TIW9wytcov8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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