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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a696558a2c71393ae18c177a22c698671e3d8fbfc7db9669c984a686e1338986' 
  AND token = 'ElNXdz//EniUcawEtbpP+Z5JyCVdWKkV4dRu6jhSVzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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