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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e41d9418c65716c91f48d1558b3e6e23d2130ab097d95bb38657e2174c3fbcf8' 
  AND token = 'lld2eRUNkp4/FzHoYUkdJJW5pVQVwQ5MgLIJ2HIeSQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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