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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92302876bcf5e9fb20aa6cd6756a31deb6085e3f747f1ca359c545964876c02f' 
  AND token = 'E7L05KAnCNe1epeK0jTeADtV1QVALd+Mwv1tcbs0tGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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