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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da6a6f4b890b9198661784e34338254592353a8eaf2fed10b9e2af03fed71ab7' 
  AND token = '1itQl53046QCGwwt42OPnmvOl3+JZ7r+VFDSLyF64SI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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