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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ba57c0ba89d61bcca8059b89d4940f193aa106cb4dcdd1bd6e3478bd449c06' 
  AND token = 'V0z15DOCgQ61YzoGD+LDOZic7AFNpq0Opo/qCTqXyu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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