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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2343b166a0a823a9569016421355d49e2a71bd71976cc58af0fda1ee1aef41' 
  AND token = 'Eq1KV8Uc79DDZU2AiIMWTyGFpJW9bYPnS36i8uKP0+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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