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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c5b080e47f1e87f85953eaf79dc9aeef105078f2ddc930b4d532bbcbc6db7a' 
  AND token = 'eHvq9WQ6XsAXB6QB/ot47ojFKIvbI1eb6uO8I3VsqMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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