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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a97a04e5a9e3cd200591cce797e20687579e7c7ca9392b5ad7b90d7143202f5' 
  AND token = 'OVXwfrMEnfK+t7Xrl3robashiCRgrtgmpzDZrOq291s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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