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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1dc3a30d6baef6aea05516077c790027e74a0c4908063d0859c5cc3f06db34' 
  AND token = 'w47DP1ZCVeGA5ubTvElNRB6si2WGdqvu+W7F1l48MHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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