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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f8d559b58e6b900a1fe385b93f34ec420b91612b0958d5c29617e2f6634d4d' 
  AND token = 'bPKgztfKlLIlJ+5UNMw6bDMah+NCtKmDhTH2k62toPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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