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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd5a7aeb40df37ded73a43aa6eac26cbb4aee8c63a89c3a401c011621e4d1bc' 
  AND token = 'UAsKMra97KO139PbLkHZhFv8ikI5TvQeb+cEnfrjjnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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