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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7e08f01cbe3dac226b638bbf475bff145d523d7336fc48ab232fd8b4ef6a9c' 
  AND token = '5e3899sYWAU2q/XgAosi5wy8u4lUo/QMoMDZlNEfRB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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