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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43f4d3db581bc013564195c8a8b650e6b4c8741a017a31883ca6bd84365e1ad' 
  AND token = 'MCEFoko4ytAnr8F/cQJ4DX76hOtxL60g6NsU7zJITIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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